Vacuum Leak Rate for HanDBase - Calculates the leak rate for a vacuum chamber, in Torr. Enter the vacuum readings in Torr (power of 10 separate, minus assumed, default to 4), set the start and end times (which can be anything from 1 second to 1 hour+) and get the 1 hour leak rate. Results are in Torr (resolution defaults to 10-3 Torr (microns) and can be changed) and Microns.